Controller and method of operating a controller
AssigneeNXP B.V.
InventorsPeter H. F. Deurenberg, Gert Van Der Horn
Life of this patent
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Abstract
A controller for controlling a power generator circuit, and a method for operation such a controller, is disclosed. The invention is particularly suited to LED current generators. The current generator may be switched off to conserve power when not required for any LED circuits. The method relates to determining the time at which the controller is required to provide power, current or voltage, and to adjust the timing of switching-on of the controller, in order to ensure that power, current or voltage is available for the load when required.
Claims20
A method of operating a controller, the controller being for controlling a power generator circuit
- for supplying power to a pulse modulated signal,
- the pulse modulated signal being for driving a load, the load being switchable with a switch,
- which controller has a cycle with a period corresponding to the sum of an off-time and an on-time,
- the power generator circuit being arranged to start to switch off at the start of the off-time, and to start to switch on at the start of the on-time,
- the method comprising the steps of:
- (a) monitoring a rate of change of output power of the power generator circuit at a time when it is ramping up from an off-state to an on-state,
- (b) determining a lead-time from the rate of change of output power,
- (c) storing the determined lead-time, and
- (d) adjusting at least one of the off-time and the on-time of the controller in dependence on the stored lead-time.
Dependencies are inferred from the claim text.